Custom Truck One Source (CTOS) CFO receives 27,895 performance stock units

Rhea-AI Filing Summary

Custom Truck One Source, Inc. Chief Financial Officer Christopher J. Eperjesy received an equity award tied to prior performance. On February 23, 2026, he acquired 27,895 shares of Common Stock at no cash cost, as a grant classified as a performance stock unit award.

The award reflects PSUs earned for a performance period that ended on December 31, 2025, following certification by the compensation committee. These shares are still subject to time-based vesting and are scheduled to fully vest on December 31, 2026. After this grant, Eperjesy directly holds 234,473 shares.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Eperjesy Christopher J

(Last) (First) (Middle)

7701 INDEPENDENCE AVE

(Street)

KANSAS CITY MISSOURI 64125

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Custom Truck One Source, Inc. [ CTOS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
02/23/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	02/23/2026		A		27,895(1)	A	$0	234,473	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents an award of performance stock units ("PSUs") earned as a result of the achievement of performance criteria pursuant to PSU awards with a performance period that ended on December 31, 2025, as certified by the compensation committee of the Issuer's board of directors on February 23, 2026. Such shares remain subject to a time-based vesting condition, which will be satisfied on December 31, 2026.

	/s/ Paul M. Jolas, Attorney-in-fact	03/26/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Custom Truck One Source (CTOS) report for its CFO?

Custom Truck One Source reported its CFO, Christopher J. Eperjesy, received 27,895 shares as an equity grant. The shares represent performance stock units earned for a completed performance period and were awarded at no cash cost, functioning as stock-based compensation rather than a market purchase.

When were the Custom Truck One Source (CTOS) performance stock units earned and certified?

The performance stock units were earned over a performance period that ended on December 31, 2025. The compensation committee of the board certified the results and the associated award on February 23, 2026, leading to the issuance of the related Common Stock shares.

Do the newly granted CTOS shares to the CFO vest immediately?

The newly granted shares do not vest immediately; they remain subject to a time-based vesting condition. According to the disclosure, the vesting requirement will be satisfied on December 31, 2026, meaning the shares effectively become fully owned only after that date is reached.

How many Custom Truck One Source (CTOS) shares does the CFO hold after this grant?

Following this equity grant, CFO Christopher J. Eperjesy directly holds 234,473 shares of Custom Truck One Source Common Stock. This total includes the 27,895 shares received from the performance stock unit award, which are still subject to time-based vesting through December 31, 2026.

Was there any cash consideration in the CFO’s recent CTOS stock award?

There was no cash consideration involved in this award; the transaction price per share is reported as 0.0000. The shares represent stock-based compensation in the form of performance stock units that were earned based on prior performance criteria and converted into Common Stock.

What type of Form 4 transaction code applies to the CTOS CFO’s award?

The transaction is reported under code “A,” indicating a grant, award, or other acquisition of securities. In this case, it reflects an award of performance stock units converted into 27,895 shares of Common Stock as part of the company’s executive compensation structure.